The OASE Vulkan 37 – 2.5 K is a 37-jet plastic fountain attachment for water feature pumps with a 1" connection. The water jets are arranged in three stages so that the appearance is reminiscent of a volcanic eruption. Suitable for OASE Aquarius Fountain Set 4000 – 12000, for example. Fountain diameter and height vary depending on pump capacity (e.g. Aquarius Fountain Set 4000, height 100 cm, diameter 85 cm).